Another of the ill-fated Bridge class.
See Kowloon Bridge.
The parlimentary debate indicates that the Tyne Bridge,
Sir John Hunter/Cast Kittiwake/Kona/Sam Hunt,
and the Sir Alexander Glen/Ocean Monarch/Ocean Mandarin
were modified "to the original design"
implying that the fault was corrected;
but the Kowloon Bridge and Derbyshire were not.
But the repairs were not completely successful.
Here's a couple of posts from Ships Nostalgia:
By Choan: Certainly, by 1986-7 when I sailed on her [Sir John Hunter],
the repair work on the vessel was far more extensive.
She had extensive doubling plates, extra repair work,
extensive large brackets in pump room along bulkhead.
The repairs, especially the cracks, were inspected
every three days according to the ship's standing orders,
in case of cracks re-appearing,
or new ones making an appearance.
By Frary: I sailed on Sir John Hunter on 1974-1975.
[At this point, the ship was less than a year old.]
We had two cracks on deck between 8 and 9 hatches.
When we got to Japan, we took on 20 Japanese welders
who stayed with us all the way to Oz and then to Cape Town.
Woinin. 1993-09_17. Ocean Mandarin, formerly Sir Alexander Glen,
sistership of Derbyshire, blacklisted by Richards Bay coal terminal.
... it was in such bad condition, it would not be allowed again
unless it was blown up and totally reconstructea ...d
Woinin. 1997-02-07. A former master of the Sam Hunt (ex Sir John Hunter),
after reading an article in Tradewinds wrote a letter to the DFA
stating that the area around Frame 65 had been strengthened
with a steel plate 24 mm thick running from one side to the other.
The Tyne Bridge was scrapped in 1987,
the Sir Alexander Glen in 1994,
and the Sir John Hunter in 1997.
The original ship of the class,
the Furness Bridge was not build with the discontinuous bulkhead.
She was in turn the Lake Arrowhead, Marcona pathfinder, World Pathfinder,
Ocean Sovereign, and scrapped in 1992.
By the way, the yard managed to lose all the drawings
of the modified desgin at frame 65,
when interest started to build in that area,